Garreth is right... and has inspired feelings of extreme jealousy in me (4 nights a week... I WISH i had that amount to time to DM!). However, being new, green or otherwise inexperienced is not a barrier to entry. Spend time reading up on the rules, familiarise yourselves with your chosen system and their usual settings and above all else apply to play games in an honest and mature manner. Most GM's will be happy to take new players as long as you are prepared to put some time into learning during downtime, have rudimentary imaginations for role play and won't ruin a campaign by being a child (i don't mean chronologically but in terms of attitude). Don't be afraid to ask questions, the only stupid question is an unasked one. Most of all though, have fun, that is what it is all about... and if your character dies well then just possess a new one (role players are essentially brain leeches of the fictional population lol).